package containers;

import java.util.List;
import java.util.Set;
import java.util.TreeSet;


class Pet{
    String sName;
    public Pet(String sName){
        this.sName = sName;
    }
}
class Cat extends Pet {
    public Cat(){
        super("cat");
    }
}
class Dog extends Pet {
    public Dog(){
        super("dog");
    }
}
public class IndividualTest {
    public static void main(String[] args){
        Set<Individual> pets = new TreeSet<Individual>();
    }
}
